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# GSI, INC.
MODEL 21
+------------------------------------------------------------+
|------------------------------------------------------------|
| Data bus: | 16-bit, ISA |
|---------------+--------------------------------------------|
| Size: | Half-length, half-height card |
|---------------+--------------------------------------------|
| Hard drive | Two IDE (AT) Interface drives |
| supported: | |
|---------------+--------------------------------------------|
| Floppy drives | Four 360KB, 720KB, 1.2MB, 1.44MB, or |
| supported: | 2.88MB drives |
+------------------------------------------------------------+
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-------------------------------------------------+----------|
| 34-pin control cable connector - regular/2.88MB | J2 |
| floppy drive | |
|-------------------------------------------------+----------|
| 34-pin control cable connector - regular floppy | J3 |
| drive | |
|-------------------------------------------------+----------|
| 5-pin connector - DC power | J5 |
|-------------------------------------------------+----------|
| 40-pin IDE(AT) Interface connector | J6 |
|-------------------------------------------------+----------|
| 4-pin connector - Drive active LED | J8 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ADDRESS |
|------------------------------------------------------------|
| Settings for Model 21 with | |
| Part # 1533-21-04-3 or | |
| earlier | |
|----------------------------+-------------------------------|
| | Address | J4/jumper 1 | J4/jumper 2 |
|-------+--------------------+---------------+---------------|
| | C800-C9FFh | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|-------+--------------------+---------------+---------------|
| » | D800-D9FFh | pins 2 & 3 | pins 1 & 2 |
| | | closed | closed |
|-------+--------------------+---------------+---------------|
| | DC00-DDFFh | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
|-------+--------------------+---------------+---------------|
| | E000-E1FFh | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|------------------------------------------------------------|
| Note: On Model 21 with Part # 1533-21-03-6 or earlier |
| address D000-D1FFh is selected instead of E000-E1FFh. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ADDRESS |
|------------------------------------------------------------|
| Settings for Model 21 with | |
| Part # 1533-21-06-8 or later | |
|------------------------------+-----------------------------|
| | Address | J4/jumper 3 | J4/jumper 4 |
|------+-----------------------+--------------+--------------|
| | C800-C9FFh | pins 1 & 2 | pins 1 & 2 |
| | | closed | closed |
|------+-----------------------+--------------+--------------|
| » | D000-D1FFh | pins 1 & 2 | pins 2 & 3 |
| | | closed | closed |
|------+-----------------------+--------------+--------------|
| | D800-D9FFh | pins 2 & 3 | pins 1 & 2 |
| | | closed | closed |
|------+-----------------------+--------------+--------------|
| | E000-E1FFh | pins 2 & 3 | pins 2 & 3 |
| | | closed | closed |
|------------------------------------------------------------|
| Note: On Model 21 with Part # 1533-21-05-0 address |
| E400-E5FFh is selected instead of E000-E1FFh. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| On Model 21 with Part # 1533-21-06-8 or later J4/jumper 2 |
| is factory configured to pins 2 & 3 closed - do not |
| alter. |
| |
| J4/jumper 1 is not used on Model 21 with Part # |
| 1533-21-06-8 or later. |
| |
| J4/jumper 3 and J4/jumper 4 are not used on Model 21 with |
| Part # 1533-21-04-3 or earlier. |
+------------------------------------------------------------+